I basically use this method all the time for my "ground brushes". Check DF or NT for example and you'll see the pattern. Usually I want the ground to be a little uneven so that it looks more realistic. Additionally, we need additional brushes for blending so it is good practice to create a template like this

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ASCII Art to be replaced once I have my stuff up and running again

And modify the vertices as described by Red.

Here is the comment: However, you HAVE TO use triangular brushes, even if it means a little more work on the template. If you use squares or rectangles you are heading for trouble (sparklies, broken brushes).

Cheers

Breli

SG name: =SG=BRELI

Harmonica: Did you bring a horse?Gunmen: Looks like we are short on one horse!Harmonica: No. You brought two too many.